Add support for PV Xcapture USB on cx231xx

This is a simple grabber card, and its addition should be simple. However, the cx231xx power management complains if some things are powered and starts to generate error -71. So, before adding the board entry, we need to apply a few fixes.

This series also have a change at tuner code that will (hopefully) help to implement support for devices with xc3028.

Mauro Carvalho Chehab (5):
[media] cx231xx: Simplify interface checking logic at probe [media] cx231xx: Use a generic check for TUNER_XC5000 [media] cx231xx: Use parameters to describe some board variants [media] cx231xx: Allow some boards to not use I2C port 3 [media] cx231xx: Add support for PV Xcapture USB

 drivers/media/video/cx231xx/cx231xx-avcore.c |   14 +-
 drivers/media/video/cx231xx/cx231xx-cards.c  |  228 +++++++++++++++-----------
 drivers/media/video/cx231xx/cx231xx-core.c   |   16 +-
 drivers/media/video/cx231xx/cx231xx-i2c.c    |   31 +++--
 drivers/media/video/cx231xx/cx231xx-video.c  |   20 +-
 drivers/media/video/cx231xx/cx231xx.h        |    5 +
 6 files changed, 180 insertions(+), 134 deletions(-)